Cake

Whoever doesn't want a huge cake?!

Even if this is just an illusion, it will cause great pain among your enemies and give you great satisfaction as they cry out in emotional pain. 

To cast this simple spell you just need to have seen a cake, wave your arms around and say 'Cakey Cakey Cakey' in a ridiculous voice. When it is cast, your enemies and pretty much whoever sees it, has to succeed a D20 Common Sense (aka Wisdom (Perception)) Check. If they fail, They run towards the cake and try to eat it, only to discover that it is an illusion, making them collapse to the ground, take 4d6 bludgeoning damage and cry in pain. Those who have weakness to cake explode.